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(PDF) Nanostructured zinc oxide microparticles with ...

The results showed that when amount of ZnO loaded is 0.003 mol,the hydrothermal time is 12 h,and the hydrothermal temperature is 180 ℃,the morphology of ZnO is the best,and the supported effect ...


Dependence of optical properties on specific surface area ...

The diffuse reflectance (DR) spectra and the cathodoluminescence (CL) spectra in the range 0.34–2.10 μm and changes in the spectra after bombardment by accelerated electrons have been studied as a function of the specific surface area and the grain sizes of titanium dioxide (rutile) powders of different grades (P1, P2, P02, R10). It has been established that the diffuse …


Optical and Structural Properties of Zinc Oxide …

the hot air oven at 60 degree Celsius. The fine powder was made by grinding the dried precipitate before using for characterization. The morphology of the ZnO nanoparticles was examined with the help of Model S-300H SEM machine. The structure and size of the ZnO nanoparticles was studied with the help of


Single step green synthesis of Au/ZnO/rGO …

The diffuse reflectance measurements (DRS) for the as synthesized nanomaterials is shown in figure 8(a). The diffuse reflectance spectrum of ZDS shows the typical absorption shorter than 380 nm. A broad visible wavelength absorption has …


Improvement of the photochromism taking place on …

The diffuse reflectance spectra and the Kubelka–Munk transforms (K/S = (1 − R) 2 /2R, with R the reflectance) of the ZnO powder for the four studied samples (Fig. 4a and b) give indications on the efficiency observed in the case of the polyol synthesis route used here in order to obtain infrared selective absorbers. Indeed, each compound is ...


XPS spectra of 5% CeO2/ZnO: a fully scanned spectra, b ...

The obtained CeO2/ZnO nanocomposite was characterized using common analytical methods such as Fourier transform infrared spectroscopy (FT-IR), UV-Visible diffuse reflectance spectroscopy (UV-DRS ...


Mechanochemical transformation of ZnO ... - …

(a) FT-IR, (b) Raman, (c) UV–visible diffuse reflectance and (d) photoluminescence spectra of (i) ZnO 2 and (ii) mechanochemically transformed ZnO from the reaction of ZnO 2 and Zn. On grinding ZnO 2 with Cu powder, reflections from unreacted metal are observed even after 5 h of reaction along with the appearance of ZnO ( Fig. 3 (a)).


Macro-/nanoporous Al-doped ZnO/cellulose composites …

The AZOC composite with average fiber diameter of 31 nm (under grinding treatment of 30 times) exhibited the highest porosity (94.6 %). The obtained ZnO/MNCF and AZOC composites were further analyzed using X-ray diffraction (XRD), Raman spectrometry, X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance spectroscopy (DRS).


Highly Visible Light Responsive ... - Scientific Reports

This paper reports that the introduction of elemental red phosphorus (RP) into TiO2 can shift the light absorption ability from the UV to the …


Synthesis, growth mechanism, optical properties and ...

Abstract. In the present study, typical ZnO microcrystals exhibiting the wurtzite hexagonal crystal structure were produced successfully, characterized by a high degree of crystallinity, via hydrothermal processing at 120, 150 and 180 °C, …


SERBIATRIB '13 - University of Belgrade

The diffuse reflectance UV–vis spectra were taken with a Thermo Evolution 300 UV-Vis Spectrophotometer equipped with a Praying Mantis device with Spectralon as the reference. Spectralon is a fluoropolymer, which has the highest diffuse reflectance of any known material or coating over the ultraviolet, visible, and near-infrared regions of


O (OH) (NO ·1.5H O/ZnO composite performance

Synthesis of Bi 6O 6(OH) 3(NO 3) 3·1.5H 2O/ZnO composite material with excellent photocatalytic hydrogen production performance Lingyi Wang a, Shichang Suna,b, Ziqing Zhong, Qingguang Gonga, Xingpeng Jianga, Weiming Zhoua, Liwei Wangb, Ming Lina and Zhanhui Yuana aCollege of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou, …


(PDF) Synthesis and Characterisation of ZnO Nanoparticals ...

EDS shows that the above route produced highly pure ZnO nanostructures. The optical band gaps of various ZnO powders were calculated from UV-visible diffuse reflectance spectroscopic studies. Antibacterial activity of ZnO nanoparticls is tested against gram positive and gram negative bacteria by using agar-well method.


The diffuse reflectance spectra of zinc oxide and zinc ...

1. Diffuse reflectance spectra of zinc oxide and zinc oxide-peroxide mixtures. Titration with KMn04 revealed that this material contained only 54% by weight ZnOg (the remain- der being water and ZnO). A sample treated with a large excess of 30% hydrogen peroxide for one week, washed with alcohol and ether, and dried under P^Os for 24 hr ...


Macro-/nanoporous Al-doped ZnO/cellulose composites …

The AZOC composite with average fiber diameter of 31 nm (under grinding treatment of 30 times) exhibited the highest porosity (94.6 %). The obtained ZnO/MNCF and AZOC composites were further analyzed using X-ray diffraction (XRD), Raman spectrometry, X-ray photoelectron spectroscopy (XPS), and UV–vis diffuse reflectance spectroscopy (DRS).


Direct synthesis of ZnO nanoparticles by a solution-free ...

The average grain size of the ZnO nanoparticles is in the range of 24-40 nm, depending on the mechanical grinding time. The UV-vis diffuse reflectance spectrum of the ZnO nanoparticles indicates a band gap of about 3.3 eV with an onset of absorption at about 3.1 eV, showing a weak red shift compared to 3.37 eV for the bulk ZnO.


Journal J. Am. Ceram. Soc., [5] 1310–16 (1998)

ZnO films containing <5 at.% indium.2 Minami and co- ... grinding and heating steps were repeated as necessary to attain ... Diffuse reflectance was measured from 200 to 900 nm using a double-beam spectrophotometer with integrating sphere (Model Cary 1E with Cary 1/3 attachment, Varian, Palo Alto, ...


A separation-free 3D network ZnO/rGO–rGH hydrogel ...

The ZnO particulate was mixed with AC (activated carbon). The mixture was then transferred to the 50 mL agate ball with a ball mill tank. The ZnO and AC mixture was then subjected to 2 h of grinding at 300 rpm to obtain the ZnO/AC. The …


Direct synthesis of ZnO nanoparticles by a solution-free ...

The average grain size of the ZnO nanoparticles is in the range of 24–40 nm, depending on the mechanical grinding time. The UV–vis diffuse reflectance spectrum of the ZnO nanoparticles indicates a band gap of about 3.3 eV with an onset of absorption at about 3.1 eV, showing a weak red shift compared to 3.37 eV for the bulk ZnO.


Highly active zinc oxide-supported lithium oxide catalyst ...

Li2O/ZnO catalyst was prepared by wet impregnation method and characterized by XRD, SEM, EDX, FTIR, BET surface area and UV-Vis diffuse reflectance spectroscopy. This study revealed a decrease in average particle size and change in the shape of the particles when Li2O was supported on ZnO. The activity of ZnO-supported lithium oxide catalyst was tested …


Facile synthesis of Te-doped ZnO nanoparticles and their ...

The present study aims to carry out synthesis and characterization of Te-doped ZnO nanoparticles using an easy, low cost and solution-free thermo-mechanical method. The structural, morphological, optoelectronic characteristics of the as-prepared Te-doped ZnO NPs were analyzed by several techniques. From the FE-SEM studies, both pristine and Te-doped …


A Ternary Magnetic Recyclable ZnO/Fe3O4/g-C3N4 …

To develop a highly efficient visible light-induced and conveniently recyclable photocatalyst, in this study, a ternary magnetic ZnO/Fe3O4/g-C3N4 composite photocatalyst was synthesized for the photodegradation of Monas dye. The structure and optical performance of the composite photocatalyst were characterized using X-ray diffraction (XRD), transmission …


Highly active zinc oxide-supported lithium oxide catalyst ...

Li 2 O/ZnO catalyst was prepared by wet impregnation method and characterized by XRD, SEM, EDX, FTIR, BET surface area and UV-Vis diffuse reflectance spectroscopy. This study revealed a decrease in average particle size and change in the shape of the particles when Li 2 O was supported on ZnO. The activity of ZnO-supported lithium oxide catalyst was tested …


The controlled synthesis of g-C3N4/Cd-doped ZnO ...

The morphology and optical properties of abovementioned NCs were characterized via TEM, XRD, XPS, and UV-visible diffuse reflectance spectroscopy. The g-C 3 N 4-doped ZnO NCs were also proven to exhibit a high degree of stability and reusability up to ten times, but were not considered good visible light harvesters. 8


AC conductivity of ZnO and Ag-ZnO nanoparticles ...

Download scientific diagram | AC conductivity of ZnO and Ag-ZnO nanoparticles. from publication: Synthesis and characterization of silver doped zno nanoparticles for hydrogen production | …


Growth of ZnO nanoparticles prepared from cost …

3.3 Diffuse reflectance study Diffuse reflectance spectra of ZnO nanoparticles and ungrinded ZnO powders are shown in Fig. 5. This figure indicates that the band edge absorbance behaviour for both of this materials is same i.e. grinding has no significant effect in optical behaviour of the material. The drastic reduc-tion of diffuse reflectance ...


PREPARATION AND CHARACTERIZATION OF ZnO/CuO …

diffuse reflectance spectrum, varying the wavelength from 200 to 800 nm as a function of the diffuse reflectance proportion. Both the ZnO and the oxides mixtures presented a similar reflectance profile, that is, approximately zero values from 200 to 370 nm, enhanced to approximately 80% reflectance at


Growth of ZnO nanoparticles prepared from cost effective ...

ZnO nanoparticles were prepared by mechanical grinding of laboratory grade ZnO powder. These nanoparticles were characterised by using X-ray diffraction analysis, transmission electron microscopy (TEM), photoluminescence and diffuse reflectance spectroscopy. From TEM study it reveals that the particles mostly show one dimensional morphology. The average …